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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the License for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the License.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>package org.apache.commons.io.input;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static org.apache.commons.io.IOUtils.EOF;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.Reader;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Arrays;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.Iterator;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.Objects;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * Provides the contents of multiple Readers in sequence.<a name="line.28"></a>
<span class="sourceLineNo">029</span> *<a name="line.29"></a>
<span class="sourceLineNo">030</span> * @since 2.7<a name="line.30"></a>
<span class="sourceLineNo">031</span> */<a name="line.31"></a>
<span class="sourceLineNo">032</span>public class SequenceReader extends Reader {<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>    private Reader reader;<a name="line.34"></a>
<span class="sourceLineNo">035</span>    private Iterator&lt;? extends Reader&gt; readers;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>    /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * Construct a new instance with readers<a name="line.38"></a>
<span class="sourceLineNo">039</span>     *<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * @param readers the readers to read<a name="line.40"></a>
<span class="sourceLineNo">041</span>     */<a name="line.41"></a>
<span class="sourceLineNo">042</span>    public SequenceReader(final Iterable&lt;? extends Reader&gt; readers) {<a name="line.42"></a>
<span class="sourceLineNo">043</span>        this.readers = Objects.requireNonNull(readers, "readers").iterator();<a name="line.43"></a>
<span class="sourceLineNo">044</span>        this.reader = nextReader();<a name="line.44"></a>
<span class="sourceLineNo">045</span>    }<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>    /**<a name="line.47"></a>
<span class="sourceLineNo">048</span>     * Construct a new instance with readers<a name="line.48"></a>
<span class="sourceLineNo">049</span>     *<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * @param readers the readers to read<a name="line.50"></a>
<span class="sourceLineNo">051</span>     */<a name="line.51"></a>
<span class="sourceLineNo">052</span>    public SequenceReader(final Reader... readers) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>        this(Arrays.asList(readers));<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    /*<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * (non-Javadoc)<a name="line.57"></a>
<span class="sourceLineNo">058</span>     *<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @see java.io.Reader#close()<a name="line.59"></a>
<span class="sourceLineNo">060</span>     */<a name="line.60"></a>
<span class="sourceLineNo">061</span>    @Override<a name="line.61"></a>
<span class="sourceLineNo">062</span>    public void close() throws IOException {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        this.readers = null;<a name="line.63"></a>
<span class="sourceLineNo">064</span>        this.reader = null;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * Returns the next available reader or null if done.<a name="line.68"></a>
<span class="sourceLineNo">069</span>     *<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @return the next available reader or null<a name="line.70"></a>
<span class="sourceLineNo">071</span>     */<a name="line.71"></a>
<span class="sourceLineNo">072</span>    private Reader nextReader() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>        return this.readers.hasNext() ? this.readers.next() : null;<a name="line.73"></a>
<span class="sourceLineNo">074</span>    }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>    /*<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * (non-Javadoc)<a name="line.77"></a>
<span class="sourceLineNo">078</span>     *<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * @see java.io.Reader#read(char[], int, int)<a name="line.79"></a>
<span class="sourceLineNo">080</span>     */<a name="line.80"></a>
<span class="sourceLineNo">081</span>    @Override<a name="line.81"></a>
<span class="sourceLineNo">082</span>    public int read() throws IOException {<a name="line.82"></a>
<span class="sourceLineNo">083</span>        int c = EOF;<a name="line.83"></a>
<span class="sourceLineNo">084</span>        while (reader != null) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>            c = reader.read();<a name="line.85"></a>
<span class="sourceLineNo">086</span>            if (c != EOF) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>                break;<a name="line.87"></a>
<span class="sourceLineNo">088</span>            }<a name="line.88"></a>
<span class="sourceLineNo">089</span>            reader = nextReader();<a name="line.89"></a>
<span class="sourceLineNo">090</span>        }<a name="line.90"></a>
<span class="sourceLineNo">091</span>        return c;<a name="line.91"></a>
<span class="sourceLineNo">092</span>    }<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>    /*<a name="line.94"></a>
<span class="sourceLineNo">095</span>     * (non-Javadoc)<a name="line.95"></a>
<span class="sourceLineNo">096</span>     *<a name="line.96"></a>
<span class="sourceLineNo">097</span>     * @see java.io.Reader#read()<a name="line.97"></a>
<span class="sourceLineNo">098</span>     */<a name="line.98"></a>
<span class="sourceLineNo">099</span>    @Override<a name="line.99"></a>
<span class="sourceLineNo">100</span>    public int read(final char[] cbuf, int off, int len) throws IOException {<a name="line.100"></a>
<span class="sourceLineNo">101</span>        Objects.requireNonNull(cbuf, "cbuf");<a name="line.101"></a>
<span class="sourceLineNo">102</span>        if (len &lt; 0 || off &lt; 0 || off + len &gt; cbuf.length) {<a name="line.102"></a>
<span class="sourceLineNo">103</span>            throw new IndexOutOfBoundsException("Array Size=" + cbuf.length + ", offset=" + off + ", length=" + len);<a name="line.103"></a>
<span class="sourceLineNo">104</span>        }<a name="line.104"></a>
<span class="sourceLineNo">105</span>        int count = 0;<a name="line.105"></a>
<span class="sourceLineNo">106</span>        while (reader != null) {<a name="line.106"></a>
<span class="sourceLineNo">107</span>            final int readLen = reader.read(cbuf, off, len);<a name="line.107"></a>
<span class="sourceLineNo">108</span>            if (readLen == EOF) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>                reader = nextReader();<a name="line.109"></a>
<span class="sourceLineNo">110</span>            } else {<a name="line.110"></a>
<span class="sourceLineNo">111</span>                count += readLen;<a name="line.111"></a>
<span class="sourceLineNo">112</span>                off += readLen;<a name="line.112"></a>
<span class="sourceLineNo">113</span>                len -= readLen;<a name="line.113"></a>
<span class="sourceLineNo">114</span>                if (len &lt;= 0) {<a name="line.114"></a>
<span class="sourceLineNo">115</span>                    break;<a name="line.115"></a>
<span class="sourceLineNo">116</span>                }<a name="line.116"></a>
<span class="sourceLineNo">117</span>            }<a name="line.117"></a>
<span class="sourceLineNo">118</span>        }<a name="line.118"></a>
<span class="sourceLineNo">119</span>        if (count &gt; 0) {<a name="line.119"></a>
<span class="sourceLineNo">120</span>            return count;<a name="line.120"></a>
<span class="sourceLineNo">121</span>        }<a name="line.121"></a>
<span class="sourceLineNo">122</span>        return EOF;<a name="line.122"></a>
<span class="sourceLineNo">123</span>    }<a name="line.123"></a>
<span class="sourceLineNo">124</span>}<a name="line.124"></a>




























































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